I don't think Facebook can in any way be compared with Google.
Google has a sustainable business model (for now), Facebook doesn't. Google isn't limited to one product, they're no longer just a search company. Facebook on the other hand, would have a mountain to climb to expand into areas other than 'social'. By the time Google was Facebooks age, they were making money which was able to sustain the business. They didn't need outside investment (I assume).
For some reason, I think Facebook doesn't want an IPO because it would show the world how much money they're actually making, at which point everyone would lose faith. Let's not forget, Facebook is 6 years old.
Facebook's profit in its 6th year of operation has been put at $220m (of $770m revenue) [1]. Google's profit in its 6th year was $342m (of $1.4bn revenue).
Facebook is not entirely a slouch in the money-making business and shows a gross profit margin higher than that of Google in its same stage of development.
I'd also suspect Facebook's revenue is more diversified than Google's which is primarily from one form of advertising. For example, the numbers suggest 10-15% of revenue comes from "virtual gifts" [2] - even that small amount of diversification would be enough to trump Google's one trick pony.
Of course, Facebook is a private company and the numbers could be wrong, as you imply. That would leave some rather big names, sources, and publications with egg on their faces though..
Google has a sustainable business model (for now), Facebook doesn't. Google isn't limited to one product, they're no longer just a search company. Facebook on the other hand, would have a mountain to climb to expand into areas other than 'social'. By the time Google was Facebooks age, they were making money which was able to sustain the business. They didn't need outside investment (I assume).
For some reason, I think Facebook doesn't want an IPO because it would show the world how much money they're actually making, at which point everyone would lose faith. Let's not forget, Facebook is 6 years old.